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The aim of this survey is to provide insight into the sequential algorithms that have been proposed to compute exact "regularities" in strings; that is, covers (or quasiperiods), seeds, repetitions, runs (or maximal periodicities), and repeats. After outlining and evaluating the algorithms that have been proposed for their computation, I suggest possibly productive future directions of research.doi:10.1016/j.ejc.2012.07.010 fatcat:4vdmvekfpngu3csv4zbz5sa4jy